Improvement in grinding edge-tools



` dilatedA Staten aient @attira a Letters Patent No. 93,031, dated July 2,7, 1869.

IIWPRQV'IEHMEIIWL-l INl G-RINDING EDGE-TOOLS.

The Schedule referred to in these Letters Patent and making part of the game.

To all whom it may concern:

Be it known that I, LORENZO ZIMMERMAN, of Wakeshma, in the county of Kalamazoo, and State of Michigan, have invented a new and useful Improvement in Grinding Edge-Tools;"and I do hereby deelarethat the following is .a full, clear, and exact description thereof, which Will enable others skilled in the art to make and use the same, reference being' had to the accompanying drawings, forming part of this specilcation.

This invention relates to a, new and useful apparatus for holding edge-tools, in grindingthem, on a grindstone; and consists in an adjustable bar, connected with the frame of the grindstone at its back end, with an adjustable lever 'attached'theretm with' a jaw on the end of the lever, for holding the tool to the bar and to the stone, arranged ashereiuaftermore fully described.

The accompanying drawing 'represents a vertical longitudinal section of agrindstone-frame, showing the stone, and my improvedA clamp for holding the tool as when in use.

Similar letters of reference indicate, corresponding parts.

bar is round in the socket, so that it may be turned o1" partially lrotated therein.

F is an adjustable collar on the round part ofthe bar, fastened byfaset-screw, t-o govern the position `(longitudinally) of the bar in the socket.

G is a metallic lever, the fulcrum of which is at h, on au ear attached to the bar C.

I is a jaw, pivoted to the end'of the lever G. The tool to be ground is placed between the bar and this jaw, where it is seen in red color inthe drawing.

1t is fastened in place andfirmly held by means of the set-screw J, which passes through 'the lever with a screw-thread, and bears upon the top' of the bar, as seen in the drawing.

It will be seen that the bar and the lever are so combined and arranged, that any description of edgetool may be held, and that by adjusting the bar inthe socket, any desired bevel maybe obtained on the tool.

Pressure or weight is put upon the clamp in grinding, if necessary.

lhevtool being rigidly held on the stone, will be much more easily ground. than it can be when held by hand, in the ordinary manner. 1

Having thus described my invention,

I claim as new, and desire to secure by Letters Y' Patent- In combination with a g1indstone,.the bar O, socket D, lever G, and jaw I, constructed,-a1ran'ged, and operating substantially as herein shown and described, for the purposes set forth. v LORENZO ZIMMERMAN.

lVitnesses:

SAMUEL C; ROSENBERRY, SYLvEsTER FREDENBURGH. 

